Abstract
The nanoscience of shampoo and conditioners touches on our everyday experience and bridges the traditional field of colloid science to emerging topics in nanoscience and biomaterials. This chapter, written for dermatologists, aims to demystify the hair care process focusing on the interactions of water, shampoo, and conditioners with hair as a biomaterial. The practical goal, to provide language that can be used when discussing hair care products, is met by reading through the discussion of the physical interactions between proteins, water, surfactants, oils, polymers, and hair. We conclude by reviewing several nanotechnology-based approaches found in hair care today as well as some emerging approaches we expect to see in future products.
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- 1.
A polymer chain in solution has S = S p + S c = (1/2)kT lnV + (3/2)k(R/b)2/N where k is Boltman’s constant, T the temperature in Kelvin, R the polymer end to end length, N the length of the polymer measured in units of the persistence length b. On dilution the polymer can give up N c counterions increasing the positional entropy by N c S p and decreasing the configurational entropy of the polymer, which collapses into a non-flexible aggregate by S c . The overly simplified result is that the cloud point is found when ln(V/V 0) > 3(R/b)2(N c /N). Since R/b–N 1/2 and N c –N, the dilution factor for any particular polymer/counter ion system ends up depending on the polymer molecular weight V/V 0–exp(MW).
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Kaplan, P.D. (2013). Nanoscience on Shampoo and Conditioner. In: Nasir, A., Friedman, A., Wang, S. (eds) Nanotechnology in Dermatology. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5034-4_4
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